Official address: http://terremoti.ingv.it
Earthquake with magnitude of ML 0.9 on date 20-01-2021 and time 18:39:21 (UTC) in region 7 km E Norcia (PG)
A magnitude ML 0.9 earthquake occured in region: 7 km E Norcia (PG), on
- 20-01-2021 18:39:21 (UTC)
- 20-01-2021 19:39:21 (UTC +01:00) Italian time
and geographic coordinates (lat, lon) 42.81, 13.17 at 11 km depth.
The earthquake was located by: Sala Sismica INGV-Roma.
Search earthquakes: Any within 30 km radius
The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.
Display location by
GeoHack
GoogleMap
OpenStreetMap
Municipalities within 20 km from the epicenter
Distances are determinated based on the geographic coordintes of the (Istat).
| Municipality | Region | Distance (km) | Inhabitants | Cumulative Inhabitants |
|---|---|---|---|---|
| Norcia | PG | 7 | 4957 | 4957 |
| Castelsantangelo sul Nera | MC | 10 | 281 | 5238 |
| Arquata del Tronto | AP | 11 | 1178 | 6416 |
| Preci | PG | 14 | 724 | 7140 |
| Montegallo | AP | 14 | 523 | 7663 |
| Accumoli | RI | 14 | 667 | 8330 |
| Visso | MC | 15 | 1107 | 9437 |
| Ussita | MC | 16 | 444 | 9881 |
| Montemonaco | AP | 16 | 604 | 10485 |
| Cascia | PG | 16 | 3217 | 13702 |
| Acquasanta Terme | AP | 20 | 2916 | 16618 |
Municipalities with at least 50000 inhabitants
An earthquake occurred to
42 Km E of Foligno (57155 inhabitants)
46 Km W of Teramo (54892 inhabitants)
51 Km NE of Terni (111501 inhabitants)
54 Km NW of L'Aquila (69753 inhabitants)
72 Km E of Perugia (166134 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
93 Km W of Pescara (121014 inhabitants)
94 Km SW of Ancona (100861 inhabitants)
96 Km NW of Chieti (51815 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km E of Viterbo (67173 inhabitants)
99 Km NE of Tivoli (56533 inhabitants)
Recent and historical Seismicity
Not available maps for this sismic event.
Seismic hazard
Not available maps for this sismic event.
Shakemap
Not available maps for this sismic event.
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire
This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
| Type | Magnitude | Date and Time (UTC) | Latitude | Longitude | Depth (km) | Published time (UTC) | Author | Location ID |
|---|---|---|---|---|---|---|---|---|
|
Reviewed Rev100 |
ML 0.9 | 2021-01-20 18:39:21 |
42.81 | 13.17 | 11 | 2021-01-20 18:45:06 |
Sala Sismica INGV-Roma | 86406491 |
Preferred location and magnitude until now.
Origin information
Origin
| Field | Value |
|---|---|
| Time (UTC) | 2021-01-20 18:39:21 ± 0.05 |
| Latitude | 42.81 ± 0.00 |
| Longitude | 13.17 ± 0.00 |
| Depth (km) | 11 ± 0 (from location) |
| Evaluation mode of Origin | manual |
| Evaluation status of Origin | reviewed |
| Version | 100 -> SURVEY-INGV |
| Event type | earthquake |
| Origin ID | 86406491 |
Uncertainty
| Field | Value |
|---|---|
| Preferred uncertainty description | uncertainty ellipse |
| Semi-major axis of confidence ellipse (meter) | 404 |
| Semi-minor axis of confidence ellipse (meter) | 340 |
| Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) | 50 |
| Circular confidence region, given by single value of horizontal uncertainty (meter) | 400 |
| Confidence level of the uncertainty (%) | 68 |
Quality
| Field | Value |
|---|---|
| Largest azimuthal gap in station distribution as seen from epicenter (degree) | 95 |
| Number of associated phases, regardless of their use for origin computation | 14 |
| Number of defining phases | 14 |
| RMS of the travel time residuals of the arrivals used for the origin computation (sec) | 0.15 |
| Epicentral distance of station closest to the epicenter (degree) | 0.05036 |
| Epicentral distance of station farthest from the epicenter (degree) | 0.28509 |
| Number of stations at which the event was observed | 8 |
| Number of stations from which data was used for origin computation | 8 |
Magnitude information
ML:0.9
| Field | Value |
|---|---|
| Value | 0.9 |
| Uncertainty | 0.3 |
| Num. used stations | 8 |
| Type of magnitude | ML |
| Reference to an origin | 86406491 |
| Agency | INGV |
| Autore | Sala Sismica INGV-Roma |
| Time of creation (UTC) | 2021-01-20 18:45:06 |
Picking and Arrival
| SCNL | Time | Uncertainty | Polarity | Evaluation_mode | Phase | Azimuth | Distance | Takeoff_angle | Residual | Weight |
|---|---|---|---|---|---|---|---|---|---|---|
| IV.CESI.HHZ. | 2021-01-20T18:39:32.16 | 0.3 | undecidable | manual | S | 315 | 0.2788 | 50 | 0.02 | 73 |
| IV.LNSS.HHZ. | 2021-01-20T18:39:30.70 | 0.6 | undecidable | manual | S | 206 | 0.2266 | 50 | 0.09 | 48 |
| IV.SMA1.EHZ. | 2021-01-20T18:39:30.16 | 0.3 | undecidable | manual | S | 146 | 0.2131 | 50 | -0.05 | 73 |
| IV.MC2.EHZ. | 2021-01-20T18:39:27.05 | 0.3 | undecidable | manual | S | 6 | 0.1043 | 133 | 0.26 | 72 |
| IV.CESI.HHZ. | 2021-01-20T18:39:27.60 | 0.3 | undecidable | manual | P | 315 | 0.2788 | 50 | 0.03 | 73 |
| IV.MMO1.EHZ. | 2021-01-20T18:39:27.86 | 0.3 | undecidable | manual | S | 51 | 0.1448 | 124 | -0.17 | 73 |
| IV.CSP1.EHZ. | 2021-01-20T18:39:27.64 | 0.3 | undecidable | manual | P | 5 | 0.2851 | 50 | -0.04 | 73 |
| IV.SMA1.EHZ. | 2021-01-20T18:39:26.53 | 0.3 | undecidable | manual | P | 146 | 0.2131 | 50 | 0.07 | 73 |
| IV.FDMO.HHZ. | 2021-01-20T18:39:26.65 | 0.3 | undecidable | manual | P | 345 | 0.2374 | 50 | -0.22 | 71 |
| IV.LNSS.HHZ. | 2021-01-20T18:39:26.71 | 0.3 | undecidable | manual | P | 206 | 0.2266 | 50 | 0.02 | 74 |
| IV.MMO1.EHZ. | 2021-01-20T18:39:25.22 | 0.1 | undecidable | manual | P | 51 | 0.1448 | 124 | 0.02 | 100 |
| IV.NRCA.HHZ. | 2021-01-20T18:39:25.20 | 0.3 | undecidable | manual | S | 301 | 0.0504 | 152 | -0.31 | 72 |
| IV.MC2.EHZ. | 2021-01-20T18:39:24.68 | 0.3 | undecidable | manual | P | 6 | 0.1043 | 133 | 0.19 | 73 |
| IV.NRCA.HHZ. | 2021-01-20T18:39:23.84 | 0.1 | undecidable | manual | P | 301 | 0.0504 | 152 | 0.1 | 100 |
Station Magnitude and Amplitude
| SCNL | mag | Generic_amplitude | Period | Type | Category | Unit | Time_window_reference |
|---|---|---|---|---|---|---|---|
| IV.NRCA.HHE. | ML:1.2 | 0.0002225 | 0.16 | AML | other | m | 2021-01-20T18:39:25.41 |
| IV.NRCA.HHN. | ML:1.3 | 0.000299 | 0.6 | AML | other | m | 2021-01-20T18:39:25.44 |
| IV.LNSS.HHE. | ML:0.8 | 3.91E-5 | 0.14 | AML | other | m | 2021-01-20T18:39:31.13 |
| IV.LNSS.HHN. | ML:0.8 | 3.84E-5 | 1 | AML | other | m | 2021-01-20T18:39:31.32 |
| IV.CESI.HHN. | ML:1.2 | 6.45E-5 | 0.18 | AML | other | m | 2021-01-20T18:39:32.56 |
| IV.CESI.HHE. | ML:0.9 | 3.485E-5 | 0.42 | AML | other | m | 2021-01-20T18:39:32.67 |
| IV.SMA1.EHE. | ML:0.4 | 1.41185795E-5 | 0.3584 | AML | other | m | 2021-01-20T18:39:30.61 |
| IV.SMA1.EHN. | ML:0.4 | 1.56069385E-5 | 0.8576 | AML | other | m | 2021-01-20T18:39:30.22 |
TDMT - Time Domain Moment Tensor
Not available TDMT solution for this seismic event.
Focal Mechanism in the area
Not available maps for this sismic event.